CVE-2015-2326

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

The pcre_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (out-of-bounds read) via regular expression with a group containing both a forward referencing subroutine call and a recursive back reference, as demonstrated by "((?+1)(\1))/".

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity55% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
75%
KEV
Not listed

Published

January 14, 2020

Last Modified

November 21, 2024

References (8)

Vendor Advisories for CVE-2015-2326(1)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibpcre3 (2:8.35-3.3ubuntu1.1) @ vivid2026-05-27ubuntu
ubuntulibpcre3 (2:8.35-7.1ubuntu1.3) @ wily2026-05-27ubuntu
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat

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

(2 across 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pcre3—2:8.35-7.2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
pcre3—2:8.35-7.2—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 4× in last 7d / 20× 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 129 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:21 UTCEPSS rescore
  3. 2026-09-15 03:05 UTCEPSS rescore
  4. 2026-09-12 14:55 UTCEPSS rescore
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  6. 2026-09-10 09:26 UTCEPSS rescore
  7. 2026-09-07 21:18 UTCOSV refresh
  8. 2026-09-07 15:56 UTCEPSS rescore
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  19. 2026-08-21 06:44 UTCOSV refresh
  20. 2026-08-20 22:50 UTCEPSS rescore
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  1. 2026-08-12 13:46 UTCEPSS rescore
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  5. 2026-08-06 13:42 UTCEPSS rescore
  6. 2026-08-05 21:21 UTCOSV refresh
  7. 2026-08-05 19:12 UTCEPSS rescore
  8. 2026-08-04 15:04 UTCEPSS rescore
  9. 2026-08-02 02:22 UTCEPSS rescore
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  17. 2026-07-23 01:16 UTCEG score recompute
  18. 2026-07-23 00:19 UTCEG score recompute
  19. 2026-07-22 21:57 UTCEG score recompute
  20. 2026-07-22 14:04 UTCEPSS rescore
  21. 2026-07-21 15:21 UTCEPSS rescore
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  23. 2026-07-20 17:03 UTCEPSS rescore
  24. 2026-07-19 21:48 UTCOSV refresh
  25. 2026-07-19 14:27 UTCEPSS rescore
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  27. 2026-07-19 02:26 UTCEPSS rescore
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  40. 2026-07-07 13:42 UTCEPSS rescore
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  44. 2026-07-04 06:27 UTCEPSS rescore
  45. 2026-07-02 15:21 UTCEPSS rescore
  46. 2026-07-02 12:33 UTCOSV refresh
  47. 2026-07-01 15:02 UTCEPSS rescore
  48. 2026-07-01 15:02 UTCEPSS rescore
  49. 2026-06-30 23:19 UTCEPSS rescore
  50. 2026-06-30 23:19 UTCEPSS rescore
  51. 2026-06-28 14:03 UTCEPSS rescore
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  54. 2026-06-25 13:47 UTCEPSS rescore
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  70. 2026-06-14 23:14 UTCEPSS rescore
  71. 2026-06-14 11:13 UTCOSV refresh
  72. 2026-06-13 22:57 UTCEPSS rescore
  73. 2026-06-12 23:09 UTCEPSS rescore
  74. 2026-06-11 13:57 UTCEPSS rescore
  75. 2026-06-10 22:15 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2015-2326?
CVE-2015-2326 is a medium vulnerability published on January 14, 2020. The pcre_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (out-of-bounds read) via regular expression with a group containing both a forward referencing subroutine call and a recursive back reference, as demonstrated by…
When was CVE-2015-2326 disclosed?
CVE-2015-2326 was first published in the National Vulnerability Database on January 14, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-2326 actively exploited?
CVE-2015-2326 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 25.4% of all scored CVEs.
What is the CVSS score of CVE-2015-2326?
CVE-2015-2326 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2015-2326?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-2326, 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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