CVE-2026-22184

CRITICALNVD 7.89.8
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-07. NVD baseline CVSS 7.8; sources differ by 2.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated

Also known asEUVD-2026-1173 (ENISA EUVD) · GHSA-7687-3v4j-49fr (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.

CVSS v3
7.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 7, 2026

Last Modified

September 1, 2026

Advisory Details (8)

Auto-updated Jun 30, 2026
Patch available. Sources: redhat.
Red Hat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json
Red HatMentions a patch (unverified)

2427688 – (CVE-2026-22184) CVE-2026-22184 zlib: zlib: Arbitrary code execution via buffer overflow in untgz utility

https://bugzilla.redhat.com/show_bug.cgi?id=2427688
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-22184
Web page

contrib/ungtz: Buffer Overflow in TGZfname() via Unbounded strcpy() on User-Supplied Archive Name · Issue #1142 · madler/zlib · GitHub

https://github.com/madler/zlib/issues/1142
Web page

zlib Home Site

https://zlib.net/
Web page

zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname
Web page

Full Disclosure: zlib v1.3.1.2 Global Buffer Overflow in TGZfname() of zlib untgz Utility via Unbounded strcpy() on User-Supplied Archive Name

https://seclists.org/fulldisclosure/2026/Jan/3
Web page

GitHub - madler/zlib: A massively spiffy yet delicately unobtrusive compression library. · GitHub

https://github.com/madler/zlib

Vendor Advisories for CVE-2026-22184(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1.3.2-r0: fixed in 1.3.2-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1.3.2-r0: fixed in 1.3.2-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1.3.2-r0: fixed in 1.3.2-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1.3.2-r0: fixed in 1.3.2-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1.3.2-r0: fixed in 1.3.2-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1:1.2.6.dfsg-1: fixed in 1:1.2.6.dfsg-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1:1.2.6.dfsg-1: fixed in 1:1.2.6.dfsg-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1:1.2.6.dfsg-1: fixed in 1:1.2.6.dfsg-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
zlib—
  • every version up to 1:1.2.6.dfsg-1: fixed in 1:1.2.6.dfsg-1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 62× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 290 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 190 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-11-13 01:51 UTCEchelonGraph re-scored
  3. 2026-11-13 01:51 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-11-12 03:13 UTCEchelonGraph re-scored
  6. 2026-11-12 03:13 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-11-11 04:35 UTCEchelonGraph re-scored
  9. 2026-11-11 04:34 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-10 16:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-11-10 05:56 UTCEchelonGraph re-scored
  12. 2026-11-10 05:56 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-11-09 07:18 UTCEchelonGraph re-scored
  15. 2026-11-09 07:18 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-11-08 08:39 UTCEchelonGraph re-scored
  18. 2026-11-08 08:39 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-11-07 10:01 UTCEchelonGraph re-scored
  21. 2026-11-07 10:01 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-11-06 11:23 UTCEchelonGraph re-scored
  24. 2026-11-06 11:23 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-06 02:55 UTCOSV refresh
Show 75 more
  1. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-11-05 12:45 UTCEchelonGraph re-scored
  3. 2026-11-05 12:45 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-11-04 14:07 UTCEchelonGraph re-scored
  6. 2026-11-04 14:07 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-11-03 15:28 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-02 16:47 UTCEchelonGraph re-scored
  10. 2026-11-02 16:47 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-11-01 17:53 UTCEchelonGraph re-scored
  13. 2026-11-01 17:53 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-31 19:15 UTCEchelonGraph re-scored
  16. 2026-10-31 19:15 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-30 20:35 UTCEchelonGraph re-scored
  19. 2026-10-30 20:35 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-29 21:57 UTCEchelonGraph re-scored
  22. 2026-10-29 21:57 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-28 23:20 UTCEchelonGraph re-scored
  25. 2026-10-28 23:19 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-10-28 00:39 UTCEchelonGraph re-scored
  28. 2026-10-28 00:39 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  30. 2026-10-27 01:58 UTCEchelonGraph re-scored
  31. 2026-10-27 01:58 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  33. 2026-10-25 23:20 UTCEchelonGraph re-scored
  34. 2026-10-25 23:20 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  36. 2026-10-25 14:42 UTCEchelonGraph re-scored
  37. 2026-10-25 00:39 UTCEchelonGraph re-scored
  38. 2026-10-25 00:39 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-10-24 02:01 UTCEchelonGraph re-scored
  41. 2026-10-24 02:01 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  43. 2026-10-23 03:23 UTCEchelonGraph re-scored
  44. 2026-10-23 03:23 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  46. 2026-10-22 04:42 UTCEchelonGraph re-scored
  47. 2026-10-22 04:41 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  49. 2026-10-21 05:58 UTCEchelonGraph re-scored
  50. 2026-10-21 05:58 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  52. 2026-10-20 07:19 UTCEchelonGraph re-scored
  53. 2026-10-20 07:19 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  55. 2026-10-19 08:39 UTCEchelonGraph re-scored
  56. 2026-10-19 08:38 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  58. 2026-10-18 09:58 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-18 03:55 UTCEchelonGraph re-scored
  60. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  61. 2026-10-17 06:41 UTCEchelonGraph re-scored
  62. 2026-10-17 06:41 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  64. 2026-10-16 07:54 UTCEchelonGraph re-scored
  65. 2026-10-16 07:54 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  67. 2026-10-15 06:54 UTCEchelonGraph re-scored
  68. 2026-10-15 06:54 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  70. 2026-10-14 02:40 UTCEchelonGraph re-scored
  71. 2026-10-14 02:40 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  73. 2026-10-12 22:51 UTCEchelonGraph re-scored
  74. 2026-10-12 22:51 UTCGHSA enrichmentGHSA-7687-3v4j-49fr · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-22184?
CVE-2026-22184 is a critical-severity vulnerability; its CVE record was published on January 7, 2026. zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz…
When was the CVE record for CVE-2026-22184 published?
The CVE record for CVE-2026-22184 was published on January 7, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 1, 2026; the record at its source may have been updated since.
Is CVE-2026-22184 actively exploited?
CVE-2026-22184 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-22184?
CVE-2026-22184 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 9.8 (CRITICAL).
How do I remediate CVE-2026-22184?
A fix for CVE-2026-22184 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-22184 are linked in the Vendor Advisories panel on this page.

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