CVE-2026-8507

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-30708 (ENISA EUVD) · GHSA-3qmj-qw66-fwx8 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fixed versions, as the CVE record's CNA (CPAN Security Group) states them: "Upgrade to 1.95 or later."

Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl have out-of-bounds (OOB) write flaws.

When parsing a PKCS12 file, with a >= 1 GiB OCTET STRING (or BIT STRING) attribute on a SAFEBAG, via info() or info_as_hash(), a heap out-of-bounds write would be triggered with remote-code-execution potential (RCE) due to a signed integer overflow in the size calculation passed to Renew().

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
50th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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 none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (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

May 17, 2026

Last Modified

October 26, 2026

Advisory Details (5)

Auto-updated Oct 26, 2026
Patch available.
Web page

oss-security - CVE-2026-8507: Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl have out of bound (OOB) write flaws

http://www.openwall.com/lists/oss-security/2026/05/17/5
Web page

Crypt-OpenSSL-PKCS12-1.95 - Perl extension to OpenSSL's PKCS12 API. - metacpan.org

https://metacpan.org/release/JONASBN/Crypt-OpenSSL-PKCS12-1.95/view/Changes.md
Web page

print_attribute default case: sprintf buffer overflow with large av->type value · Issue #56 · dsully/perl-crypt-openssl-pkcs12 · GitHub

https://github.com/dsully/perl-crypt-openssl-pkcs12/issues/56
Web page

print_attribute: missing length guard and strncpy null-termination in BMPSTRING/UTF8STRING cases · Issue #55 · dsully/perl-crypt-openssl-pkcs12 · GitHub

https://github.com/dsully/perl-crypt-openssl-pkcs12/issues/55

Vendor Advisories for CVE-2026-8507(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-openssl-pkcs12-perl1.94-1 ... 1.99-1 (6 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-openssl-pkcs12-perl1.94-1
  • every version up to 1.95-1: fixed in 1.95-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 65× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 99 of 386 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 287 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  2. 2026-10-27 11:18 UTCEG score recompute
  3. 2026-10-27 11:18 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  5. 2026-10-26 13:26 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-10-25 16:44 UTCEG score recompute
  7. 2026-10-25 16:44 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  9. 2026-10-25 13:55 UTCEG score recompute
  10. 2026-10-24 18:52 UTCEG score recompute
  11. 2026-10-24 18:52 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  13. 2026-10-23 21:01 UTCEG score recompute
  14. 2026-10-23 21:01 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  16. 2026-10-22 23:09 UTCEG score recompute
  17. 2026-10-22 23:09 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-22 01:16 UTCEG score recompute
  20. 2026-10-22 01:16 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  22. 2026-10-21 03:17 UTCEG score recompute
  23. 2026-10-21 03:17 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  25. 2026-10-20 05:11 UTCEG score recompute
Show 74 more
  1. 2026-10-20 05:11 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  3. 2026-10-19 06:19 UTCEG score recompute
  4. 2026-10-19 06:19 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  6. 2026-10-18 08:26 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-18 03:06 UTCEG score recompute
  8. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  9. 2026-10-17 09:45 UTCEG score recompute
  10. 2026-10-17 09:45 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  12. 2026-10-16 11:43 UTCEG score recompute
  13. 2026-10-16 11:43 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-15 12:31 UTCEG score recompute
  16. 2026-10-15 12:31 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  18. 2026-10-14 07:55 UTCEG score recompute
  19. 2026-10-14 07:55 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  21. 2026-10-13 03:08 UTCEG score recompute
  22. 2026-10-13 03:08 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  24. 2026-10-12 14:53 UTCEG score recompute
  25. 2026-10-12 05:16 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-11 19:18 UTCEG score recompute
  27. 2026-10-11 16:34 UTCEG score recompute
  28. 2026-10-11 13:52 UTCEG score recompute
  29. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  30. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  31. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  32. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  33. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  34. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  35. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  36. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  37. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  38. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  39. 2026-09-30 11:17 UTCOSV refresh
  40. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  41. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  42. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  43. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  44. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  45. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  46. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  47. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  48. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  49. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  50. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  51. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  52. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  53. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  54. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  55. 2026-09-11 18:10 UTCOSV refresh
  56. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  57. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  58. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  59. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  60. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  61. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  62. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  63. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  64. 2026-08-30 19:18 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  65. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  66. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  67. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  68. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  69. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  70. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  71. 2026-08-23 21:36 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-08-23 17:19 UTCEG score recompute
  73. 2026-08-23 17:19 UTCGHSA enrichmentGHSA-3qmj-qw66-fwx8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 48th percentile

Frequently asked(5)

What is CVE-2026-8507?
CVE-2026-8507 is a critical-severity vulnerability; its CVE record was published on May 17, 2026. Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl have out-of-bounds (OOB) write flaws. When parsing a PKCS12 file, with a >= 1 GiB OCTET STRING (or BIT STRING) attribute on a SAFEBAG, via info() or infoashash(), a heap out-of-bounds write would be triggered with remote-code-execution potential…
When was the CVE record for CVE-2026-8507 published?
The CVE record for CVE-2026-8507 was published on May 17, 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 26, 2026; the record at its source may have been updated since.
Is CVE-2026-8507 actively exploited?
CVE-2026-8507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8507?
CVE-2026-8507 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8507?
A fix for CVE-2026-8507 is available: update to the fixed version the vendor names in its advisory. Fixed versions, as the CVE record's CNA (CPAN Security Group) states them: "Upgrade to 1.95 or later." The vendor advisories EchelonGraph has for CVE-2026-8507 are linked in the Vendor Advisories panel on this page.

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