CVE-2026-53585

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, git_delta_apply in src/libgit2/delta.c trusts the attacker-controlled res_sz value parsed by hdr_sz from a delta object header and passes that amount to git__malloc before validating delta instructions. Malicious pack data supplied through git_clone, git_fetch, git_remote_fetch, git_indexer_append, or a local attacker-supplied repository can use a very small multi-level OFS_DELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
0.5%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

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 partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 9, 2026

Advisory Details (6)

Auto-updated Aug 20, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

libgit2 v1.9.5

Patch available: libgit2/libgit2 v1.9.5

https://github.com/libgit2/libgit2/releases/tag/v1.9.5
github_release Patch Available

libgit2 v1.8.6

Patch available: libgit2/libgit2 v1.8.6

https://github.com/libgit2/libgit2/releases/tag/v1.8.6
github_commit

commit dec22ac01ad9 (libgit2/libgit2)

Fix landed in libgit2/libgit2 commit dec22ac01ad9 — awaiting tagged release

https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed
github_commit Patch Available

commit c1896f06df22 (libgit2/libgit2)

Patch available: libgit2/libgit2 v1.8.6 (contains commit c1896f06df22)

https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae
github_commit Patch Available

commit 0cdfdd5fa8f8 (libgit2/libgit2)

Patch available: libgit2/libgit2 v1.9.5 (contains commit 0cdfdd5fa8f8)

https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30
githubMentions a patch (unverified)🟡 PoC Available

Unbounded Memory Allocation via Delta Object Result-Size Header · Advisory · libgit2/libgit2 · GitHub

https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j

Vendor Advisories for CVE-2026-53585(1)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgit2-fixtures (1.7.2+ds-1ubuntu3.1) @ noble2026-10-09ubuntu
redhatlibgit2-main-1.9.7-1.hum12026-08-25redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libgit21.5.1+ds-1 ... 1.9.7+ds-1 (32 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libgit21.9.0+ds-2
  • every version up to 1.9.0+ds-2+deb13u1: fixed in 1.9.0+ds-2+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libgit21.9.0+ds-2 ... 1.9.4+ds-1 (13 versions)
  • every version up to 1.9.6+ds-1: fixed in 1.9.6+ds-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 21× in last 7d / 78× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-09 08:22 UTCEG score recompute
  3. 2026-10-09 08:22 UTCVendor advisory
  4. 2026-10-08 17:12 UTCEPSS rescore
  5. 2026-10-08 05:16 UTCEG score recompute
  6. 2026-10-08 05:16 UTCVendor advisory
  7. 2026-10-07 23:48 UTCEPSS rescore
  8. 2026-10-07 04:11 UTCEG score recompute
  9. 2026-10-07 04:11 UTCVendor advisory
  10. 2026-10-06 15:18 UTCEPSS rescore
  11. 2026-10-06 03:24 UTCVendor advisory
  12. 2026-10-06 03:21 UTCVendor advisory
  13. 2026-10-06 03:21 UTCVendor advisory
  14. 2026-10-06 03:20 UTCEG score recompute
  15. 2026-10-06 03:20 UTCVendor advisory
  16. 2026-10-05 17:43 UTCEPSS rescore
  17. 2026-10-04 23:22 UTCEPSS rescore
  18. 2026-10-04 20:51 UTCVendor advisory
  19. 2026-10-03 16:46 UTCEG score recompute
  20. 2026-10-03 16:46 UTCVendor advisory
  21. 2026-10-03 14:26 UTCEPSS rescore
  22. 2026-10-02 17:56 UTCEPSS rescore
  23. 2026-10-02 09:46 UTCEG score recompute
  24. 2026-10-02 09:46 UTCVendor advisory
  25. 2026-10-01 19:50 UTCEPSS rescore
Show 75 more
  1. 2026-10-01 09:00 UTCEG score recompute
  2. 2026-10-01 09:00 UTCVendor advisory
  3. 2026-09-30 15:03 UTCEPSS rescore
  4. 2026-09-30 08:12 UTCEG score recompute
  5. 2026-09-30 08:12 UTCVendor advisory
  6. 2026-09-29 15:22 UTCEPSS rescore
  7. 2026-09-29 04:38 UTCEG score recompute
  8. 2026-09-29 04:38 UTCVendor advisory
  9. 2026-09-28 13:51 UTCEPSS rescore
  10. 2026-09-28 03:48 UTCEG score recompute
  11. 2026-09-28 03:48 UTCVendor advisory
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-27 02:58 UTCEG score recompute
  14. 2026-09-27 02:58 UTCVendor advisory
  15. 2026-09-26 15:59 UTCEPSS rescore
  16. 2026-09-25 09:41 UTCEG score recompute
  17. 2026-09-25 09:41 UTCVendor advisory
  18. 2026-09-24 14:04 UTCEPSS rescore
  19. 2026-09-24 08:53 UTCEG score recompute
  20. 2026-09-24 08:53 UTCVendor advisory
  21. 2026-09-23 17:54 UTCEPSS rescore
  22. 2026-09-23 08:07 UTCEG score recompute
  23. 2026-09-23 08:07 UTCVendor advisory
  24. 2026-09-22 07:21 UTCEG score recompute
  25. 2026-09-22 07:21 UTCVendor advisory
  26. 2026-09-21 06:34 UTCEG score recompute
  27. 2026-09-21 06:34 UTCVendor advisory
  28. 2026-09-20 20:16 UTCEPSS rescore
  29. 2026-09-20 05:47 UTCEG score recompute
  30. 2026-09-20 05:47 UTCVendor advisory
  31. 2026-09-19 05:01 UTCEG score recompute
  32. 2026-09-19 05:01 UTCVendor advisory
  33. 2026-09-18 19:28 UTCEPSS rescore
  34. 2026-09-18 04:14 UTCEG score recompute
  35. 2026-09-18 04:14 UTCVendor advisory
  36. 2026-09-17 03:28 UTCEG score recompute
  37. 2026-09-17 03:28 UTCVendor advisory
  38. 2026-09-16 14:08 UTCEPSS rescore
  39. 2026-09-16 05:15 UTCEPSS rescore
  40. 2026-09-16 02:36 UTCEG score recompute
  41. 2026-09-16 02:36 UTCVendor advisory
  42. 2026-09-15 01:49 UTCVendor advisory
  43. 2026-09-14 01:02 UTCEG score recompute
  44. 2026-09-14 01:02 UTCVendor advisory
  45. 2026-09-13 16:47 UTCEPSS rescore
  46. 2026-09-13 00:15 UTCEG score recompute
  47. 2026-09-13 00:15 UTCVendor advisory
  48. 2026-09-11 23:28 UTCEG score recompute
  49. 2026-09-11 23:28 UTCVendor advisory
  50. 2026-09-11 14:53 UTCEPSS rescore
  51. 2026-09-10 22:27 UTCEG score recompute
  52. 2026-09-10 22:27 UTCVendor advisory
  53. 2026-09-10 09:35 UTCEPSS rescore
  54. 2026-09-09 21:40 UTCVendor advisory
  55. 2026-09-09 04:15 UTCEG score recompute
  56. 2026-09-09 04:15 UTCVendor advisory
  57. 2026-09-08 22:01 UTCEPSS rescore
  58. 2026-09-08 03:29 UTCEG score recompute
  59. 2026-09-08 03:29 UTCVendor advisory
  60. 2026-09-07 16:01 UTCEPSS rescore
  61. 2026-09-07 02:43 UTCEG score recompute
  62. 2026-09-07 02:43 UTCVendor advisory
  63. 2026-09-06 13:47 UTCEPSS rescore
  64. 2026-09-06 01:51 UTCEG score recompute
  65. 2026-09-06 01:51 UTCVendor advisory
  66. 2026-09-05 01:02 UTCEG score recompute
  67. 2026-09-05 01:02 UTCVendor advisory
  68. 2026-09-04 05:06 UTCEPSS rescore
  69. 2026-09-04 00:13 UTCVendor advisory
  70. 2026-09-02 23:23 UTCEG score recompute
  71. 2026-09-02 23:23 UTCVendor advisory
  72. 2026-09-02 14:12 UTCEPSS rescore
  73. 2026-09-01 22:36 UTCEG score recompute
  74. 2026-09-01 22:36 UTCVendor advisory
  75. 2026-09-01 13:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-53585?
CVE-2026-53585 is a medium vulnerability published on August 20, 2026. libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, gitdeltaapply in src/libgit2/delta.c trusts the attacker-controlled ressz value parsed by hdrsz from a…
When was CVE-2026-53585 disclosed?
CVE-2026-53585 was first published on August 20, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53585 actively exploited?
CVE-2026-53585 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53585?
CVE-2026-53585 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53585?
A fix for CVE-2026-53585 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53585 are linked in the Vendor Advisories panel on this page.

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