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: 0.3%, top 74% of all CVEs by exploit prediction. 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%CVSS: 5.3Exploit: Elevated riskExposed: 0

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
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

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
github Patch Available🟡 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 / EcosystemFixed in / PatchReleasedSource
ubuntulibgit2-dev (0.24.1-2ubuntu0.2+esm3) @ xenial2026-09-19ubuntu
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 rangeFixed inDependents
libgit21.5.1+ds-1 ... 1.9.7+ds-1 (32 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libgit21.9.0+ds-21.9.0+ds-2+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libgit21.9.0+ds-2 ... 1.9.4+ds-1 (13 versions)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 17× in last 7d / 80× 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.

  1. 2026-09-19 05:01 UTCEG score recompute
  2. 2026-09-19 05:01 UTCVendor advisory
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 04:14 UTCEG score recompute
  5. 2026-09-18 04:14 UTCVendor advisory
  6. 2026-09-17 03:28 UTCEG score recompute
  7. 2026-09-17 03:28 UTCVendor advisory
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-16 02:36 UTCEG score recompute
  11. 2026-09-16 02:36 UTCVendor advisory
  12. 2026-09-15 01:49 UTCVendor advisory
  13. 2026-09-14 01:02 UTCEG score recompute
  14. 2026-09-14 01:02 UTCVendor advisory
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-13 00:15 UTCEG score recompute
  17. 2026-09-13 00:15 UTCVendor advisory
  18. 2026-09-11 23:28 UTCEG score recompute
  19. 2026-09-11 23:28 UTCVendor advisory
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-10 22:27 UTCEG score recompute
  22. 2026-09-10 22:27 UTCVendor advisory
  23. 2026-09-10 09:35 UTCEPSS rescore
  24. 2026-09-09 21:40 UTCVendor advisory
  25. 2026-09-09 04:15 UTCEG score recompute
Show 55 more
  1. 2026-09-09 04:15 UTCVendor advisory
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-08 03:29 UTCEG score recompute
  4. 2026-09-08 03:29 UTCVendor advisory
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-07 02:43 UTCEG score recompute
  7. 2026-09-07 02:43 UTCVendor advisory
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 01:51 UTCEG score recompute
  10. 2026-09-06 01:51 UTCVendor advisory
  11. 2026-09-05 01:02 UTCEG score recompute
  12. 2026-09-05 01:02 UTCVendor advisory
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-04 00:13 UTCVendor advisory
  15. 2026-09-02 23:23 UTCEG score recompute
  16. 2026-09-02 23:23 UTCVendor advisory
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 22:36 UTCEG score recompute
  19. 2026-09-01 22:36 UTCVendor advisory
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-31 21:49 UTCVendor advisory
  23. 2026-08-30 21:02 UTCEG score recompute
  24. 2026-08-30 21:02 UTCVendor advisory
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 01:22 UTCEPSS rescore
  27. 2026-08-29 20:15 UTCEG score recompute
  28. 2026-08-29 20:15 UTCVendor advisory
  29. 2026-08-28 21:41 UTCEPSS rescore
  30. 2026-08-28 19:29 UTCVendor advisory
  31. 2026-08-27 18:42 UTCEG score recompute
  32. 2026-08-27 18:42 UTCVendor advisory
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-26 17:53 UTCEG score recompute
  35. 2026-08-26 17:53 UTCVendor advisory
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-25 16:26 UTCEG score recompute
  38. 2026-08-25 16:26 UTCVendor advisory
  39. 2026-08-25 15:30 UTCEG score recompute
  40. 2026-08-25 15:30 UTCVendor advisory
  41. 2026-08-25 13:49 UTCEPSS rescore
  42. 2026-08-24 22:24 UTCEG score recompute
  43. 2026-08-24 22:24 UTCVendor advisory
  44. 2026-08-23 21:38 UTCEG score recompute
  45. 2026-08-23 21:38 UTCVendor advisory
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 20:52 UTCEG score recompute
  48. 2026-08-22 20:52 UTCVendor advisory
  49. 2026-08-21 23:49 UTCEPSS rescore
  50. 2026-08-21 20:05 UTCVendor advisory
  51. 2026-08-20 19:18 UTCEG score recompute
  52. 2026-08-20 19:18 UTCVendor advisory
  53. 2026-08-20 18:52 UTCEG score recompute
  54. 2026-08-20 18:52 UTCVendor advisory
  55. 2026-08-20 18:51 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 73.7% of all scored CVEs.
What is the CVSS score of CVE-2026-53585?
CVE-2026-53585 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-53585?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53585, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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