CVE-2026-49476

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 58% 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 — Patch released this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 15, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit.
github Patch Available🟡 PoC Available

Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve · Advisory · facelessuser/soupsieve · GitHub

https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x
github_release Patch Available

2.8.4

Patch available: facelessuser/soupsieve 2.8.4

https://github.com/facelessuser/soupsieve/releases/tag/2.8.4
github_commit Patch Available

commit 28108ab80581 (facelessuser/soupsieve)

Patch available: facelessuser/soupsieve 2.8.4 (contains commit 28108ab80581)

https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39

Vendor Advisories for CVE-2026-49476(4)

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
redhatrhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9:17870735932026-08-27redhat
redhatpython-rpds-py-main-2026.6.3-1.hum12026-07-01redhat
redhatpython-attrs-main-26.1.0-3.hum12026-06-07redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
soupsieve2.2.1-1 ... 2.8.4-1 (15 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
soupsieve2.3.2-1 ... 2.8.4-1 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
soupsieve2.7-1, 2.7-2, 2.8.1-1, 2.8.3-1, 2.8.4-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
soupsieve2.7-1, 2.7-2, 2.8.1-1, 2.8.3-12.8.4-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
soupsieve0.4 ... 2.8.3 (51 versions)2.8.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 106× 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 143 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-49476?
CVE-2026-49476 is a high vulnerability published on July 9, 2026. Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile()…
When was CVE-2026-49476 disclosed?
CVE-2026-49476 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49476 actively exploited?
CVE-2026-49476 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.9% of all scored CVEs.
What is the CVSS score of CVE-2026-49476?
CVE-2026-49476 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-49476?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49476, 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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