CVE-2026-107161

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-07. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-94582 (ENISA EUVD) · GHSA-4jhc-cc62-fwcm (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.4%
EPSS %ILE
32nd
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-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 or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade 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 or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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

October 7, 2026

Last Modified

November 6, 2026

Advisory Details (2)

Auto-updated Oct 7, 2026
Patch available. Sources: redhat.
Red Hat

2460420 – (CVE-2026-107161) CVE-2026-107161 cyrus-sasl: Heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise DIGEST-MD5 clients

https://bugzilla.redhat.com/show_bug.cgi?id=2460420
Red HatMentions a patch (unverified)

CVE-2026-107161 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-107161

Vendor Advisories for CVE-2026-107161(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg-10
  • every version up to 2.1.28+dfsg-10+deb12u1: fixed in 2.1.28+dfsg-10+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg1-10, 2.1.28+dfsg1-11, 2.1.28+dfsg1-12, 2.1.28+dfsg1-9
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg1-10, 2.1.28+dfsg1-11, 2.1.28+dfsg1-9
  • every version up to 2.1.28+dfsg1-12: fixed in 2.1.28+dfsg1-12
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 54× 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 105 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 5 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 08:16 UTCEchelonGraph re-scored
  2. 2026-11-13 08:16 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-11-06 21:35 UTCEchelonGraph re-scored
  10. 2026-11-06 21:35 UTCVendor advisory
  11. 2026-11-06 21:35 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-11-06 08:27 UTCEchelonGraph re-scored
  14. 2026-11-06 08:27 UTCVendor advisory
  15. 2026-11-06 08:27 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-11-06 07:43 UTCEchelonGraph re-scored
  17. 2026-11-06 07:43 UTCVendor advisory
  18. 2026-11-06 07:43 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-11-05 16:27 UTCEchelonGraph re-scored
  21. 2026-11-05 16:27 UTCVendor advisory
  22. 2026-11-05 16:27 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-11-05 16:08 UTCEchelonGraph re-scored
  24. 2026-11-05 16:08 UTCVendor advisory
  25. 2026-11-05 16:08 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  3. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-10-30 22:26 UTCEchelonGraph re-scored
  7. 2026-10-30 22:26 UTCVendor advisory
  8. 2026-10-30 22:26 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-30 22:15 UTCEchelonGraph re-scored
  10. 2026-10-30 22:15 UTCVendor advisory
  11. 2026-10-30 22:15 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-10-30 21:26 UTCEchelonGraph re-scored
  13. 2026-10-30 21:26 UTCVendor advisory
  14. 2026-10-30 21:26 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-10-30 21:14 UTCEchelonGraph re-scored
  16. 2026-10-30 21:14 UTCVendor advisory
  17. 2026-10-30 21:14 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-30 16:44 UTCEchelonGraph re-scored
  19. 2026-10-30 16:44 UTCVendor advisory
  20. 2026-10-30 16:44 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  22. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  23. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  24. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  25. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  26. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  27. 2026-10-25 14:54 UTCEchelonGraph re-scored
  28. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  29. 2026-10-24 06:04 UTCEchelonGraph re-scored
  30. 2026-10-24 06:04 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  31. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  32. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  33. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  34. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  35. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  36. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  37. 2026-10-18 05:07 UTCEchelonGraph re-scored
  38. 2026-10-17 19:21 UTCEchelonGraph re-scored
  39. 2026-10-17 19:21 UTCVendor advisory
  40. 2026-10-17 19:21 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  42. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  43. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  44. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  45. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  46. 2026-10-12 16:39 UTCEchelonGraph re-scored
  47. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  48. 2026-10-12 02:27 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-10-11 20:14 UTCEchelonGraph re-scored
  50. 2026-10-11 18:26 UTCEchelonGraph re-scored
  51. 2026-10-11 14:41 UTCEchelonGraph re-scored
  52. 2026-10-11 14:41 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  54. 2026-10-11 02:56 UTCEchelonGraph re-scored
  55. 2026-10-11 02:56 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  57. 2026-10-10 15:07 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-10-10 03:21 UTCEchelonGraph re-scored
  59. 2026-10-10 03:21 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  60. 2026-10-10 03:00 UTCEchelonGraph re-scored
  61. 2026-10-10 03:00 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-10-09 23:24 UTCEchelonGraph re-scored
  63. 2026-10-09 23:23 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-10-09 22:21 UTCEchelonGraph re-scored
  65. 2026-10-09 22:20 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  67. 2026-10-09 14:03 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-10-09 02:18 UTCEchelonGraph re-scored
  69. 2026-10-09 02:18 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-10-09 01:28 UTCEchelonGraph re-scored
  71. 2026-10-09 01:28 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-10-08 21:01 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-10-08 19:55 UTCEchelonGraph re-scored
  74. 2026-10-08 19:55 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  75. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile

Frequently asked(5)

What is CVE-2026-107161?
CVE-2026-107161 is a high-severity vulnerability; its CVE record was published on October 7, 2026. A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters)…
When was CVE-2026-107161 made public?
CVE-2026-107161 was made public on October 7, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on October 7, 2026. EchelonGraph's copy of the record carries a last-modified date of November 6, 2026; the record at its source may have been updated since.
Is CVE-2026-107161 actively exploited?
CVE-2026-107161 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107161?
CVE-2026-107161 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107161?
A fix for CVE-2026-107161 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107161 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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