CVE-2026-48959

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.

fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.

Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 4, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-48959: IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward

http://www.openwall.com/lists/oss-security/2026/05/27/2
generic

Changes - metacpan.org

https://metacpan.org/release/PMQS/IO-Compress-2.220/changes
generic
https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch

Vendor Advisories for CVE-2026-48959(2)

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

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.101-1 ... 2.223-1 (22 versions)——
perl5.32.1-4 ... 5.44.0-1 (59 versions)——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.204-1 ... 2.223-1 (15 versions)——
perl5.36.0-10 ... 5.44.0-1 (42 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.213-1 ... 2.223-1 (9 versions)——
perl5.40.1-6 ... 5.44.0-1 (10 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.213-1, 2.214-1, 2.217-1, 2.219-1, 2.219-22.220-1—
perl5.40.1-6, 5.40.1-75.40.1-8—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 99× 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 254 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-48959?
CVE-2026-48959 is a high vulnerability published on May 27, 2026. IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.…
When was CVE-2026-48959 disclosed?
CVE-2026-48959 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48959 actively exploited?
CVE-2026-48959 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 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-48959?
CVE-2026-48959 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-48959?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48959, 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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