CVE-2026-6103

LOWNVD 3.33.3
EchelonGraph scoreMEDIUM confidence

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

This low-severity CVE scores 3.3 under NVD CVSS v3. EPSS exploit probability: 0.2% (5th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-87322 (ENISA EUVD)Source: ENISA EUVD

3.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.2%CVSS: 3.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check. The field is 11 octal digits wide and holds values up to 0x1FFFFFFFF, so a size above 0xFFFFFFFF silently wraps. The parser then skips the wrong number of data blocks and interprets attacker-controlled file content as the next TAR header, which lets a crafted archive inject entries that PharData reports and extracts as if they were genuine.

CVSS v3
3.3
EG Score
3.3LOWmedium confidence
EG Risk
31
EG Risk 31/100

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)
Severity33% × 45%
Impact severity (EG Severity): CVSS 3.3 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.
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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.2%
EPSS %ILE
5th
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 (3.3): severity, escalated by confirmed exploitation. This CVE's 3.3 is its impact severity (EG Severity), not escalated.

EG Severity
3.3 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. 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: 60 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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

September 25, 2026

Last Modified

October 23, 2026

Advisory Details (1)

Auto-updated Sep 25, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection · Advisory · php/php-src · GitHub

https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuphp7.4-zip (7.4.3-4ubuntu2.29+esm4) @ focal2026-10-23ubuntu
redhatphp:7.4-8100020261021081045.f79986652026-10-21redhat
redhatphp-main-8.5.11-2.hum12026-09-23redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(12 across 6 ecosystems)
Alpine:v3.22(3)
PackageVulnerable rangeFix by version rangeDependents
php82—
  • every version up to 8.2.35-r0: fixed in 8.2.35-r0
—
php83—
  • every version up to 8.3.36-r0: fixed in 8.3.36-r0
—
php84—
  • every version up to 8.4.27-r0: fixed in 8.4.27-r0
—
Alpine:v3.23(3)
PackageVulnerable rangeFix by version rangeDependents
php83—
  • every version up to 8.3.36-r0: fixed in 8.3.36-r0
—
php84—
  • every version up to 8.4.27-r0: fixed in 8.4.27-r0
—
php85—
  • every version up to 8.5.12-r0: fixed in 8.5.12-r0
—
Alpine:v3.24(3)
PackageVulnerable rangeFix by version rangeDependents
php83—
  • every version up to 8.3.35-r0: fixed in 8.3.35-r0
—
php84—
  • every version up to 8.4.26-r0: fixed in 8.4.26-r0
—
php85—
  • every version up to 8.5.11-r0: fixed in 8.5.11-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
php8.28.2.10-1 ... 8.2.7-1~deb12u1 (29 versions)
  • every version up to 8.2.34-1~deb12u1: fixed in 8.2.34-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
php8.48.4.11-1 ... 8.4.24-1~deb13u1 (11 versions)
  • every version up to 8.4.26-1~deb13u1: fixed in 8.4.26-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
php8.48.4.11-1 ... 8.4.26-1~deb13u1 (12 versions)
  • every version up to 8.4.26-1: fixed in 8.4.26-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 34× 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.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  5. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-31 20:25 UTCOSV refresh
  14. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-25 14:15 UTCEchelonGraph re-scored
  22. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  24. 2026-10-23 14:28 UTCEchelonGraph re-scored▼ 1.00
  25. 2026-10-23 14:28 UTCVendor advisory
Show 66 more
  1. 2026-10-23 14:25 UTCNVD updateCVSS v3 → 3.3 · severity → LOW
  2. 2026-10-22 20:26 UTCEchelonGraph re-scored
  3. 2026-10-22 20:26 UTCVendor advisory
  4. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  5. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-18 03:25 UTCEchelonGraph re-scored
  10. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-12 15:51 UTCEchelonGraph re-scored
  16. 2026-10-11 19:35 UTCEchelonGraph re-scored
  17. 2026-10-11 16:50 UTCEchelonGraph re-scored
  18. 2026-10-11 14:12 UTCEchelonGraph re-scored
  19. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-10-11 06:31 UTCEchelonGraph re-scored
  21. 2026-10-11 06:31 UTCVendor advisory
  22. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-10-10 05:44 UTCEchelonGraph re-scored
  24. 2026-10-10 05:44 UTCVendor advisory
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  26. 2026-10-09 05:03 UTCEchelonGraph re-scored
  27. 2026-10-09 05:03 UTCVendor advisory
  28. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  29. 2026-10-08 04:21 UTCEchelonGraph re-scored
  30. 2026-10-08 04:21 UTCVendor advisory
  31. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  32. 2026-10-07 03:39 UTCEchelonGraph re-scored
  33. 2026-10-07 03:39 UTCVendor advisory
  34. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  35. 2026-10-06 02:56 UTCEchelonGraph re-scored
  36. 2026-10-06 02:56 UTCVendor advisory
  37. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  38. 2026-10-05 02:14 UTCEchelonGraph re-scored
  39. 2026-10-05 02:14 UTCVendor advisory
  40. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  41. 2026-10-04 01:31 UTCEchelonGraph re-scored
  42. 2026-10-04 01:31 UTCVendor advisory
  43. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  44. 2026-10-03 00:45 UTCEchelonGraph re-scored
  45. 2026-10-03 00:45 UTCVendor advisory
  46. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  47. 2026-10-02 00:03 UTCEchelonGraph re-scored
  48. 2026-10-02 00:03 UTCVendor advisory
  49. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  50. 2026-09-30 22:58 UTCEchelonGraph re-scored
  51. 2026-09-30 22:58 UTCVendor advisory
  52. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  53. 2026-09-29 22:16 UTCEchelonGraph re-scored
  54. 2026-09-29 22:16 UTCVendor advisory
  55. 2026-09-28 23:23 UTCEchelonGraph re-scored
  56. 2026-09-28 23:23 UTCVendor advisory
  57. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  58. 2026-09-27 22:42 UTCEchelonGraph re-scored
  59. 2026-09-27 22:42 UTCVendor advisory
  60. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  61. 2026-09-26 22:00 UTCEchelonGraph re-scored
  62. 2026-09-26 22:00 UTCVendor advisory
  63. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  64. 2026-09-25 21:19 UTCEchelonGraph re-scored
  65. 2026-09-25 20:24 UTCEchelonGraph re-scoredFirst assessed: 4.3 MEDIUM
  66. 2026-09-25 20:24 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-6103?
CVE-2026-6103 is a low-severity vulnerability; its CVE record was published on September 25, 2026. phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check. The field is 11 octal digits wide and holds values up to 0x1FFFFFFFF, so a size above 0xFFFFFFFF silently wraps. The parser then skips the wrong number of data blocks and interprets…
When was the CVE record for CVE-2026-6103 published?
The CVE record for CVE-2026-6103 was published on September 25, 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 October 23, 2026; the record at its source may have been updated since.
Is CVE-2026-6103 actively exploited?
CVE-2026-6103 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6103?
CVE-2026-6103 has a CVSS v3 base score of 3.3 (NVD).
How do I remediate CVE-2026-6103?
A fix for CVE-2026-6103 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6103 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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