CVE-2026-5673

MEDIUMNVD 5.65.6—
EchelonGraph scoreMEDIUM confidence

Score 5.6 from GitHub Security Advisory published 2026-04-06. NVD baseline CVSS 5.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.

CVSS v3
5.6
EG Score
5.6(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

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
Severity56% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

April 6, 2026

Last Modified

May 1, 2026

Advisory Details (3)

Auto-updated May 1, 2026
Patch available. Sources: redhat.
generic

Heap buffer over-read in avi_parse_input_file() when parsing truncated hdrl strh chunk · Issue #24 · xiph/theora · GitHub

https://github.com/xiph/theora/issues/24
redhat

2455340 – (CVE-2026-5673) CVE-2026-5673 libtheora: libtheora: Denial of Service or Information Disclosure via malformed AVI file processing

https://bugzilla.redhat.com/show_bug.cgi?id=2455340
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-5673

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libtheora1.1.1+dfsg.1-15 ... 1.2.0~alpha1+dfsg-6 (17 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libtheora1.1.1+dfsg.1-16.1 ... 1.2.0~alpha1+dfsg-6 (15 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libtheora1.2.0+dfsg-1 ... 1.2.0~alpha1+dfsg-6 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libtheora1.2.0+dfsg-1 ... 1.2.0~alpha1+dfsg-6 (7 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 24× 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 155 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-5673?
CVE-2026-5673 is a medium vulnerability published on April 6, 2026. A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the aviparseinput_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a…
When was CVE-2026-5673 disclosed?
CVE-2026-5673 was first published in the National Vulnerability Database on April 6, 2026, with the most recent update on May 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5673 actively exploited?
CVE-2026-5673 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 92.5% of all scored CVEs.
What is the CVSS score of CVE-2026-5673?
CVE-2026-5673 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2026-5673?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5673, 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.

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